US6770082B2 - Surgical headframe with soft contact pads for use with a stereotactic system - Google Patents

Surgical headframe with soft contact pads for use with a stereotactic system Download PDF

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Publication number
US6770082B2
US6770082B2 US09/961,569 US96156901A US6770082B2 US 6770082 B2 US6770082 B2 US 6770082B2 US 96156901 A US96156901 A US 96156901A US 6770082 B2 US6770082 B2 US 6770082B2
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Prior art keywords
headframe
frame body
contact pads
patient
head
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Expired - Lifetime, expires
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US09/961,569
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US20020042619A1 (en
Inventor
Leonel Dominguez
Michael S. Ferrell
Prasad Nalluri
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Medtronic Inc
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Medtronic Inc
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Priority to US09/961,569 priority Critical patent/US6770082B2/en
Assigned to MEDTRONIC, INC. reassignment MEDTRONIC, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DOMINGUEZ, LEONEL, FERRELL, MICHAEL S., NALLURI, PRASAD
Publication of US20020042619A1 publication Critical patent/US20020042619A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/10—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges for stereotaxic surgery, e.g. frame-based stereotaxis
    • A61B90/14—Fixators for body parts, e.g. skull clamps; Constructional details of fixators, e.g. pins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
    • A61B2034/2072—Reference field transducer attached to an instrument or patient
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
    • A61B2090/3937—Visible markers
    • A61B2090/3945—Active visible markers, e.g. light emitting diodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B90/00—Instruments, implements or accessories specially adapted for surgery or diagnosis and not covered by any of the groups A61B1/00 - A61B50/00, e.g. for luxation treatment or for protecting wound edges
    • A61B90/39—Markers, e.g. radio-opaque or breast lesions markers
    • A61B2090/3983—Reference marker arrangements for use with image guided surgery
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B34/00—Computer-aided surgery; Manipulators or robots specially adapted for use in surgery
    • A61B34/20—Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis

Definitions

  • the present invention relates to a headframe for use with a stereotactic system. More particularly, it relates to a surgical headframe for accurate, non-traumatic (non-invasive) positioning (fixation) of a reference frame to a patient as part of a stereotactic system, especially a tandem optical stereotactic device.
  • Stereotactic surgical systems provide surgeons with visual guidance information of surgical instruments/probes relative to an enclosed anatomical position, especially within the cranium or head.
  • a stereotactic surgical system provides a quantitative determination of an anatomical position based upon a scanned image, such as a CAT scan, MRI scan, PET scan, etc. This scanned information is processed by a computer to produce a displayable image of the head. Subsequently, during a surgical procedure, the stereotactic system relates a position of a surgical instrument otherwise deployed within the anatomical body of interest (e.g., the head) relative to the previously-generated scanned information in visual form.
  • Stereotactic devices are highly useful in the field of neurosurgery, and more recently ENT procedures requiring instrument deployment in close proximity to the optic nerve, carotid artery, skull base, facial nerve, internal auditory canal, etc.
  • a more recent stereotactic system is optical or camera based in which two cameras are employed to visualize special instruments in a surgical field, digitize the viewed information from the camera and relate it via computer graphics to image data generated by the above-described image scanning techniques. The relationship of the optical camera(s) view and the image data will then make quantitative the anatomy seen in the camera view and also make quantitative the position of surgical instruments such as probes, microscopes, or space pointers, etc., relative to the anatomy via registration of the camera view to the image data.
  • An example of such a tandem optical, stereotactic device is available under the trade name LandmarTM ENT Image Guidance System, from Medtronic-Xomed of Jacksonville, Fla.
  • a stereotactic or dynamic reference frame must be fixed to the patient's head to provide accurate positioning information.
  • a wide variety of headframes or headframes have been developed to facilitate fixation of the reference frame to the patient's head.
  • important constraints relating to the headframe design include precise positioning of the reference frame relative to the patient's head, relatively long-term fixation, and allowing for movement of the patient's head without deviation of a position of the reference frame relative to the head during the surgical procedure.
  • many of the available stereotactic headframes incorporate one or more bone screws or bone pins to physically secure the headframe to the skull. Obviously, this is highly invasive, and contrary to the minimally invasive nature of intended procedures.
  • other stereotactic headframes are tightly clamped to the patient's head. Due to the possibility of headframe movement along the patient's skin, the clamping device(s) is typically very rigid, again causing discomfort to the patient under extended usage.
  • Surgical stereotactic systems continue to rapidly evolve with improvements to imaging and display components.
  • the headframe apparatus has essentially remained unchanged, and is unacceptably bulky and invasive or traumatic. Therefore, a need exists for an improved surgical headframe for use with a stereotactic system.
  • the headframe includes a frame body, first and second arms, a plurality of contact pads, and a strap.
  • the first and second arms extend from opposing sides of the frame body, respectively.
  • the plurality of contact pads are coupled to the frame body and are each adapted to engage a patient's head.
  • the strap is selectively connectible to the first and second arms.
  • the strap is adapted for wrapping about a back of a patient's head.
  • three contact pads are provided, and are arranged in a tripod-like fashion.
  • the contact pads are pivotally coupled to the frame body, and are co-planer.
  • the headframe is highly stable when applied to the patient's head.
  • a control pad is mounted to the frame body.
  • Yet another aspect of the present invention relates to a method of securing a reference frame to a patient's head as part of a surgical procedure.
  • the method includes providing a surgical headframe having a frame body, first and second arms, a plurality of contact pads, and a strap.
  • the first and second arms extend from opposing sides of the frame body.
  • the contact pads are coupled to the frame body.
  • the strap is selectively securable to the first and second arms.
  • the reference frame is mounted to the headframe.
  • the headframe is then positioned at the patient's head such that the contact pads contact the patient's head.
  • the strap is then wrapped behind the patient's head.
  • the strap is secured to the first and second arms.
  • the first and second arms are rotatably mounted to the frame body, thereby reducing moment forces generated by extension of the strap about the patient's head from being transmitted to the patient's forehead and serve to increase user comfort.
  • Yet another aspect of the present invention relates to a method of manufacturing a surgical headframe for use in a stereotactic procedure.
  • the method includes providing a frame body having a central portion and opposing sides. First and second arms are extended from the opposing sides of the frame body, respectively. A plurality of contact pads are coupled to the frame body. In this regard, each of the contact pads are adapted to engage a patient's head. Finally, a strap is selectively secured to the first and second arms opposite the frame body. To this end, the strap is adapted for wrapping about a back of a patient's head.
  • the headframe is adapted to receive and maintain a stereotactic reference frame.
  • a first contact pad is coupled to the central portion of the frame body, and the second and third contact pads are positioned opposite one another relative to the first contact pad.
  • FIG. 1 is a perspective view of a surgical headframe in accordance with the present invention applied to a patient;
  • FIGS. 2A-2C illustrate a frame body of the headframe of FIG. 1;
  • FIGS. 3A-3B illustrate a swivel arm portion of the headframe of FIG. 1;
  • FIG. 4 illustrates a strap portion of the headframe of FIG. 1
  • FIG. 5 is a cross-sectional view of a contact pad
  • FIGS. 6 illustrates contact pads assembled to the frame body
  • FIG. 7 illustrates assembly of the swivel arms to the frame body
  • FIG. 8 illustrates auxiliary components assembled to the headframe of FIG. 1 .
  • FIG. 1 A preferred embodiment of a surgical headframe 10 is provided in FIG. 1 as applied to a patient 11 .
  • the surgical headframe 10 is for use with a stereotactic image guidance system (not shown), an example of which is available under the trade name LandmarX® from Medtronic-Xomed.
  • the headframe 10 includes a head frame body 12 , swivel arms 14 , a strap 16 , and contact pads 18 a - 18 c . Details on the various components are provided below.
  • the head frame body 12 is configured for placement about a patient's skull.
  • the swivel arms 14 extend from opposite sides of the frame body 12 , respectively.
  • the strap 16 is connected to, and extends between, the swivel arms 14 a , 14 b .
  • the contact pads 18 a - 18 c are secured to the frame body 12 as shown, positioned to precisely fixate the headframe 10 relative to the patient's skull.
  • the surgical headframe 10 is preferably configured to receive and rigidly maintain a dynamic reference frame (not shown), such as at a post or lug 20 otherwise formed by the frame body 12 .
  • the frame body 12 is shown in greater detail in FIGS. 2A-2C.
  • the frame body 12 is preferably formed from a rigid, light-weight material, such as aluminum, and forms the post 20 , a central portion 30 , a first leg 32 , and a second leg 34 .
  • the first and second legs 32 , 34 extend in opposite directions from the central portion 30 , and are preferably identical in construction.
  • each of the arms 32 , 34 includes a first section 36 and second section 38 .
  • the first section 36 extends in an angular fashion from the central portion 30 .
  • the second section 38 extends downwardly from the first section 36 (or rearwardly relative to the orientation of FIG. 2A) and defines an arm receiving region 40 and a pad receiving region 42 .
  • the arm receiving region 40 is configured to receive a respective one of the swivel arms 14 (FIG. 1) at an engagement surface 58 via a lateral passage 44 formed therein.
  • the pad receiving region 42 is configured to receive a respective one of the contact pads 18 (FIG. 1) via a transverse bore 46 (best shown in FIG. 2 C).
  • the central portion 30 similarly forms a transverse bore 48 for mounting of one of the contact pads 18 (FIG. 1 ).
  • the frame body 12 is highly planar or flat at an inner surface 50 thereof. That is to say, regardless of how the legs 32 , 34 are formed relative to the central portion 30 , the frame body 12 is, as a whole, planar at the inner surface 50 .
  • FIGS. 2B and 2C This preferred configuration is illustrated in FIGS. 2B and 2C.
  • the contact pads 18 otherwise assembled to the respective passages 46 , 48 , are similarly oriented in a planar fashion.
  • the transverse bores 46 are equidistantly spaced relative to the central portion 30 , and thus relative to the transverse bore 48 formed therein.
  • This configuration effectively positions the subsequently assembled contact pads 18 in a triangular or tripod-type configuration relative to the frame body 12 .
  • this tripod configuration provides increased lateral stability when the headframe 10 is secured fixed to a patient.
  • the frame body 12 has an overall width (i.e., distance between the respective second sections 38 of the legs 32 , 34 ) of 4.125 inches and a height (i.e., distance between pad receiving region 42 and central portion 30 ) of 2.25 inches. These preferred dimensions correspond generally with the spacing of an adult forehead. Alternatively, however, other dimensions are equally acceptable.
  • the post 20 extends in a perpendicular fashion (relative to the inner surface 50 ) from an outer surface 52 .
  • the post 20 includes an auxiliary frame receiving body 54 including a central passage 54 and a starburst or toothed surface 56 .
  • the swivel arm 14 is preferably integrally formed from a rigid, light-weight material, such as aluminum, and is defined by a base 60 , an intermediate section 62 , and a leading end 64 .
  • the base 60 is configured for mounting to the frame body 12 (FIG. 2) and defines an inner face 66 through which a passage 68 transversely extends.
  • the base 60 extends transversely relative to the intermediate section 62 .
  • the inner face 66 is non-contiguous with a corresponding surface of the intermediate section 62 such that the inner face 66 is non-planar relative to the intermediate section 62 .
  • a plane of the inner face 66 extends at an angle of approximately 32°, although other dimensions are equally acceptable. Regardless, the inner face 66 is configured to abut a corresponding surface of a respective one of the arm receiving regions 40 (FIG. 2A) previously described, for example the engagement surface 58 (FIG. 2 A).
  • the angular orientation of the inner face 66 relative to the intermediate section 62 facilitates extension of the swivel arm 14 along a side of a patient's head (not shown), as well as allowing the swivel arm 14 to rotate in the plane of the inner face 66 .
  • the intermediate section 62 is depicted in FIG. 3A as including opposing shoulders 70 which are provided to receive and maintain auxiliary components (not shown). Alternatively, where the auxiliary components are unnecessary or are secured to other portions of the headframe 10 , the shoulders 70 can be eliminated. Finally, the leading end 64 forms an opening 72 for receiving a pin (not shown) for securing the strap 16 (FIG. 1) to the swivel arm 14 .
  • the strap 16 is shown in greater detail in FIG. 4 .
  • the strap 16 is preferably formed of an elastic material, preferably silicone, and includes strips 80 a , 80 b extending in an opposing fashion from a central region 82 .
  • the strap 16 is preferably sized for wrapping about a patient's head (not shown), and preferably has an overall length on the order of 21 inches.
  • Each of the strips 80 forms holes 84 , sized for coupling to a pin (not shown) otherwise mounted to a respective one of the swivel arms 14 (FIG. 3 ).
  • the central region 82 preferably has an increased width relative to that of the strips 80 , and is sized for placement over, or to straddle, the occipital bone. Alternatively, other configurations are equally acceptable.
  • the contact pad 18 is shown in greater detail in FIG. 5 .
  • the contact pad 18 is preferably formed from a soft, autoclavable material, such as silicone, and defines an inner surface 90 , a rim 92 , and a contact surface 94 .
  • An opening 96 is formed through the inner surface 90 and is configured to receive a coupling device (not shown) for attachment to the frame body 12 (FIG. 2 A).
  • a ball joint or ball and socket device (not shown) is preferably used to pivotally couple the contact pad 18 to the frame body 12 .
  • the opening 86 is sized to receive a portion of the coupling device in a manner that allows convenient disassembly therefrom, such that after use, the contact pad 18 can easily be removed and discarded or recycled, with the coupling device available for re-use following appropriate cleaning/sterilization.
  • the rim 92 defines an outer diameter of the contact pad 18 , preferably approximately 2 inches in diameter, it being understood that a wide variety of other dimensions, either greater or smaller, are equally acceptable.
  • the contact surface 94 extends in a generally concave fashion from the rim 92 . With this curved configuration, in conjunction with the durometer of the material selected for the contact pad 18 , optimal comfort is provided to the patient, while providing maximum stability.
  • each of the contact pads 18 a - 18 c can be maneuvered or swiveled relative to the frame body 12 so as to accommodate a particular patient's head shape.
  • the contact pads 18 a - 18 c are arranged in a triangular or “tripod” fashion, with the contact pads 18 a , 18 c being equidistantly spaced from the contact pad 18 b .
  • This triangular arrangement of the contact pads 18 a - 18 c provides greatly enhanced lateral stability relative to a two-pad design, thereby restricting overall motion of the individual contact pads 18 .
  • each of the swivel arms 14 is mounted to the frame body 12 by a coupling device 100 including a threaded pin 102 and a head 104 .
  • the pin 102 extends through the lateral passage 44 associated with the arm receiving region 40 of the frame body 12 and threadably engages the passage 68 formed in the base 60 of the respective swivel arm 14 .
  • the head 104 is preferably configured to provide convenient grasping by a surgeon who rotates the head 104 to thread the pin 102 into the base 60 .
  • the inner face 66 of the swivel arm 14 abuts the engagement surface 58 of the arm receiving region 40 .
  • the engagement surface 58 and the inner face 66 are preferably flat such that, where desired, the swivel arm 14 can freely rotate relative to the frame body 12 about the pin 102 .
  • the swivel arms 14 a , 14 b are preferably assembled to allow for 360° movement relative to the frame body 12 .
  • this preferred construction eliminates bending movements or forces from transferring from the step 16 (FIG. 1) through the respective pins 102 to the frame body 12 that might otherwise cause the headframe 10 (FIG. 1) to slip or move from a desired position.
  • FIG. 7 depicts retention pins 110 a , 110 b extending from the leading ends 64 of the swivel arms 14 a , 14 b , respectively.
  • the retention pins 110 a , 110 b are available for receiving and maintaining the strap 16 .
  • the surgical headframe 10 is secured to a patient's head 120 (preferably the forehead) by first locating the contact pads 18 against the head 120 .
  • the concave nature of the contact pads 18 facilitates “gripping” of the contact pads 18 to the head 120 .
  • the swivel arms 14 extend rearwardly relative to the patient's head 120 , substantially along the patient's temple, or slightly above the ears.
  • the strap 16 is then wrapped behind the patient's head 120 , much like a diving mask, and secured to the retention pins 110 a , 110 b via the holes 84 .
  • the central region 82 (FIG.
  • the surgical headframe 10 can be tightly positioned or forced against the patient's head 120 .
  • the contact pads 18 can swivel slightly to match the contours of the patient's head 120 .
  • the triangular or tripod-like arrangement of the contact pads 18 renders the surgical headframe 10 highly stable relative to the patient's head 120 . That is to say, the triangular orientation provides stability in all planes, and specifically prevents “rocking” of the headframe 10 along any one axis.
  • the contact pad 18 b associated with the central portion 30 of the frame body 12 is offset from the plane in which the strap 16 wraps about the patient's head 120 .
  • the contact pad 18 b effectively stretches the skin engaged by the contact pad 18 b , further enhancing overall stability.
  • the triangular or tripod arrangement of the contact pads 18 prevents skin between each of the contact pads 18 from stretching. This phenomenon is often times found with other non-traumatic headframe designs, and presents a distinct opportunity for undesirable headframe movement. Thus, movement problems associated with skin stretch found with other devices is eliminated with the tripod-like configuration of the present invention.
  • the surgical headframe 10 is available for receiving and maintaining other components of the stereotactic system.
  • a dynamic reference frame 130 and a touch pad 132 are preferably secured to the post 20 as shown in FIG. 8 .
  • the dynamic reference frame 130 maintains one or more optical emitters 134 (shown generally in FIG. 8) that are utilized by the stereotactic system during surgical procedures.
  • the dynamic reference frame 130 is rigidly secured to the surgical headframe 10 via the post 20 .
  • the surgical headframe 10 is fixed to the patient's head 120 (FIG. 1 ).
  • the dynamic reference frame 130 is rigidly associated with the patient's head 120 , and establishes a consistent reference zone even with movement of the patient's head 120 .
  • the touch pad 132 is an auxiliary device available to provide the surgeon with the ability to effectuate changes in the use/display of the stereotactic system. It should be understood, however, that the touch pad 132 is not a required element of the present invention, and can be secured to areas other than the post 20 .
  • the surgical headframe of the present invention provides a marked improvement over previous designs. Fixation of the surgical headframe to a patient's head is non-invasive as it does not entail the use of bone screws or other incisions through the patient's skin. Further, as compared to clamp-type headframe designs, use of soft contact pads against the patient's skin greatly reduces the opportunity for trauma. Finally, by preferably orientating three contact pads in a triangular or tripod configuration, the headframe is highly stable in all dimensions.
  • the surgical headframe has been described as preferably employing three contact pads, a two-contact pad design can also be employed.
  • the head frame assumes a semi-circular arc conforming to a patient's forehead and includes a mounting lug for maintaining the dynamic reference frame.
  • the head frame rests on the patient's forehead on the two-curved, swiveling pin-jointed contact pads and is held in place by way of an elastic strap.
  • preferred dimensions have been ascribed to the various components, other dimensions, either greater or smaller, are equally acceptable.
  • the frame body and swivel arms need not be made from aluminum. Instead, a wide variety of other materials are available.
  • the frame body and swivel arms (as well as other components of the headframe) are formed of a non-magnetic material such as plastic, ceramic, or other composite such that the headframe is compatible with MRI, CT, X-ray and magnetic stereotactic devices/procedures.

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  • Health & Medical Sciences (AREA)
  • Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Oral & Maxillofacial Surgery (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Engineering & Computer Science (AREA)
  • Neurosurgery (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Pathology (AREA)
  • Molecular Biology (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Microscoopes, Condenser (AREA)
US09/961,569 2000-09-24 2001-09-24 Surgical headframe with soft contact pads for use with a stereotactic system Expired - Lifetime US6770082B2 (en)

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EP (1) EP1322247B1 (de)
AT (1) ATE292424T1 (de)
DE (1) DE60109949T2 (de)
WO (1) WO2002024096A1 (de)

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US12090093B2 (en) 2022-11-07 2024-09-17 Frederick H. Sklar Surgical universal headrest including skull pin holder assembly
US12090094B2 (en) 2022-11-07 2024-09-17 Frederick H. Sklar Surgical universal headrest including skull pin holder assembly
US12209704B2 (en) 2022-11-07 2025-01-28 Frederick H. Sklar Base station assembly for an operating room table
US12345373B2 (en) 2022-11-07 2025-07-01 Frederick H. Sklar Base station assembly for an operating room table
US12409090B2 (en) 2022-11-07 2025-09-09 Frederick H. Sklar Surgical universal headrest including skull pin holder assembly

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ATE292424T1 (de) 2005-04-15
DE60109949D1 (de) 2005-05-12
US20020042619A1 (en) 2002-04-11
EP1322247B1 (de) 2005-04-06
EP1322247A1 (de) 2003-07-02
WO2002024096A1 (en) 2002-03-28

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